A. Answer the following questions.
1. difine pollution.
2. how have we polluted the air, water and soil of the earth.
3. what is global warming? give an example of a place affected by global warming.
4. what is green house effect?
5. what is global warming?
6. what is waste.
7. distinguish between bio degradable and non-biodegradable waste.
8. what are three 'R's? write two lines on each.
Answers
Explanation:
1. the presence in or introduction into the environment of a substance which has harmful or poisonous effects.
"the level of pollution in the air is rising"
2. Burning coal to create electricity pollutes the air. Industries and homes generate garbage and sewage that can pollute the land and water. Pesticides—chemical poisons used to kill weeds and insects—seep into waterways and harm wildlife.
3.
One of the most dramatic effects of global warming is the reduction in Arctic sea ice. Sea ice hit record-low extents in both the fall and winter of 2015 and 2016, meaning that at the time when the ice is supposed to be at its peak, it was lagging.
4. The greenhouse effect is a process that occurs when energy from a planet's sun goes through its atmosphere and warms the planet's surface, but the atmosphere prevents the heat from returning directly to space, resulting in a warmer planet.
5. Global warming is the term used to describe the rising of the average temperature on Earth
6. Waste are unwanted or unusable materials. Waste is any substance which is discarded after primary use, or is worthless, defective and of no use. A by-product by contrast is a joint product of relatively minor economic value
7. Biodegradable wastes are those substances that degrade or break down naturally. Non-biodegradable wastes are those substances that do not degrade easily. Materials like plants, animals, their waste, paper, fruits, vegetables fall under the category of biodegradable substances.
8. The three R's – reduce, reuse and recycle – all help to cut down on the amount of waste we throw away. They conserve natural resources, landfill space and energy. Plus, the three R's save land and money communities must use to dispose of waste in landfills.